Title (fr)

Publication

Application

Priority

DE 19842838 A 19980918

Abstract (en)

The sealing for the sides of at least one over- or under pressure zone (P1,P2), at a moving surface (20) in a papermaking machine has at least one seal (15) at a holding zone (17) of a holder (10) with movement in relation to the holder to bear against the moving surface (20). The holding zone (17) is a clamp holder, where the seal (15) is held by a clamping force through clamping surfaces. The holding zone (17) is generally filled on at least one plane at right angles to the alignment direction of the seal (15). The holding zone is an open channel (17) towards the moving surface (20), with a free square or rectangular cross section surface, and the side walls are the clamping surfaces. At least one clamping surface is formed in part by a clamp unit (130), preferably in a groove (45) in a side wall (11,12) of the holder (10), open towards the seal (15). The clamp (130) acts as a seal, and has elastic distortion with a clamp pressure hose (50). The seal (15) is supported by a pressure hose at the holding zone (17), to press the seal against the moving surface (20). The pressure levels in the support (55) and clamp (50) hoses are equal while the seal (15) is presented to and pressed against the moving surface (20). The pressure hoses (50) are linked to a common pressure source. A moving piston (60) is in the grooves (45) at the side walls (11,12) of the holder (10), between the clamping pressure hoses (50) and the seal (15). The piston (60) is of a material with low elasticity. The surface of the seal (15) towards the moving surface (20) is a wear layer, and the lower end of the seal (15) is a clamping section. The wear layer and clamping section are of different materials from the body of the seal (15). The holder (10) is moved to the moving surface (20) with a unit parallel to the laying direction, and is mounted to a suction/blower box and especially in a spring mounting. The clamping force is set according to the gap between the seal (15) and the moving surface (20) and/or according to the pressure in laying the seal (15) against the moving surface (20). When the seal (15) is in contact with the moving surface (20), the press force on it is set according to the ratio between the clamping force and the bending force to fit the seal (15) to the contour of the moving surface (20). The press force on the seal (15) is reduced down to zero after it comes into contact with the moving surface (20). The clamping force is greater or less than the bending force, and the press force can be reduced to a level which is the difference between the clamping and bending forces.